# Tag Info

Accepted

### What is a "hanging node" in the finite element meshing?

The following picture illustrates a mesh with a hanging node and a mesh containing no hanging node: Usually with a finite element mesh the vertices are shared with their other neighbouring elements, ...
• 1,859
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### Need a simple mesh format (for FEA) and a tool to generate the mesh

I would recommend gmsh. I have just started working with this program actually only a few days ago. But it is straight-forward to use. You can create various 2D and even 3D-geometries and it offers a ...
• 350
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### Library for generating Discontinuous Galerkin FEM mesh

You are confused about different concepts. A mesh is really just a collection of cells defined by the vertices of the mesh and which vertices together form each cell. Consequently, a mesh is an ...
• 51.3k
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### Algorithm to find boundary faces of mesh

First, create a list of faces in the mesh. From there you should be able to create a map from faces to tets, as each face must belong to either one or two tets. The faces that belong to only one tet ...
Accepted

• 8,172
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### Meshing options to generate number of the sides of and element (tetgen-triangle)

I have implemented a method that works pretty well for reconstructing edge information in surfacic meshes (or facet information in volumetric meshes), but I am working in C++. I'll try to explain that ...
• 2,205
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### Using Gmsh to create a mesh with zero thickness (quad) interface elements

One way to do it might be to create an internal Line Loop in the input file where the crack originates. To do this, you would create 2 points at each end of the crack in your .geo file (say, points 1,...
• 1,522

### Need a simple mesh format (for FEA) and a tool to generate the mesh

If you have access to MATLAB, you might consider using PDE Toolbox to generate your geometry and mesh: http://www.mathworks.com/help/pde/index.html It is very easy to generate simple geometries like ...
• 5,744

### Mesh generator that can do 2D & 3D elements combined?

If I understand what you're saying, you have something like a sandwich of epoxy layers that have appreciable thickness (modeled in 3D) and a thin copper layer between them that has negligible ...
• 29.9k

### Which type of meshing is more suited for simulation of electromagnetic metamaterial unit cells?

As for any other domain, your mesh needs to be fine enough to resolve the features you have. This means that the mesh has to be finer than the geometric details of your unit cell, and it needs to be ...
• 51.3k

### How do you mesh and re-mesh a surface (2-manifold) in 4D?

You can use a 2D anisotropic mesh generator (see e.g. H. Borouchaki, George, P. L. , F. Hecht , P. Laug and E. Saltel, Delaunay mesh generation governed by metric specifications. Part 1: Algorithms, ...
• 2,205
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### Combined translational and rotational meshing in gmsh

I cannot visualize your geometry properly using Gmsh, or export it. I generated something similar using FreeCAD. Maybe you can modify this script for your purposes. ...
• 8,101
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### From edge-vertex connectivty to face-vertex connectivity?

As noted in the comments, your problem doesn't seem quite solvable as stated. However, if you include the assumption that each node has a 2D coordinate associated with it, then it is solvable. With ...
• 1,522

### Commonly-used metrics to quantify the irregularity of a triangular mesh

I do not think that there exists an answer to this question in general, because it all depends on the intended use for the mesh. For instance, if you are doing computational fluid dynamics, you may ...
• 2,205
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### Determinant of jacobian matrix

The determinant of the Jacobian, as a determinant changes its sign when odd permutations of columns (or rows) are applied. Imagine, for simplicity a two dimensional case in which the reference ...
• 1,606

### How can I coarsen a mesh in Gmsh when 'Mesh options' include 'Refine by splitting' but nothing about coarsening?

To create a coarser mesh, you can set the characteristic length globally to a larger value, e.g., ...
• 558
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### Definition of Lagrange nodes in Gmsh

I think you've got slightly the wrong end of the stick from the documentation. As with a lot of other software in the area, GMSH started out with low order, hard coded numberings. These are the ones ...
• 2,199
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### Is there any fundamental difference between meshing for FEM, FVM and FDM?

You are correct that FDM requires structured meshes, so you are restricted to those. On the other hand FEM and FVM can both do structured meshes as well as unstructured meshes depending on the ...
• 499